Hot Vs Cold Rolled Sheet Metal

Hot rolled steel is used in situations where precise shapes and tolerances are not required.

Hot vs cold rolled sheet metal.

In comparison a cold rolled steel product with the same chemical composition has a yield strength of 365 mpa. Cold rolling steel allows for the creation of very precise shapes. From the point of view of metal the boundary between cold rolling and hot rolling should be distinguished by recrystallization temperature. Hot rolled steel sheets are used in fabrication work where aesthetics and quality are not very important.

Cold rolled steel is going to be stronger overall than hot rolled steel. It s through a series of breakdown semi finishing sizing semi roughing roughing and finishing that cold rolled steel shapes can be created. Cold rolled steel is essentially hot rolled steel that has had further processing. This is important because cold rolled steel is going to be strongest when it s laid with the grain and is significantly weaker against the grain.

During the hot rolling process steel is heated to its melting point while being worked changing the composition of the steel to make it more malleable. Cold rolled steel is essentially hot rolled steel that has been through further processing. Note that cold rolled steel has grains while hot rolled steel does not. As an example a hot rolled steel product may have a yield strength of 235 mpa.

Cold rolled steel cold rolled steel is essentially hot rolled steel that has gone through more processing. Cold worked steels are typically harder and stronger than standard hot rolled steels. For example consumer electronics and telecom products metal furniture automobile industry etc. Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening.

Hot rolled products like hot rolled steel bars are used in the welding and construction trades to make railroad tracks and i beams for example. Hot rolling and cold rolling are two methods of shaping steel. Once hot rolled steel has cooled it is then re rolled at room temperature to achieve more exact dimensions and better surface qualities. The main advantages of cold working are.

But cold rolled steel undergoes additional processing steps resulting in improved properties that can be exploited for different applications. Thus the yield strength of cold rolled steel is higher than that of hot rolled steel. Cold rolled is a normal temperature hot rolled is a high temperature. Whereas cold rolled steel sheets are used for precision and quality fabrication work.

For example railway track automotive frames structural frames low accuracy sheet metal parts etc. During cold rolling the steel is annealed or exposed to heat and allowed to cool which improves ductility.